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143 papers · 1 filter
Noncommutative Black Holes and the Singularity Problem
C. Bastos, O. Bertolami, N. C. Dias +1
A phase-space noncommutativity in the context of a Kantowski-Sachs cosmological model is considered to study the interior of a Schwarzschild black hole. Due to the divergence of th…
Non-Canonical Phase-Space Noncommutativity and the Kantowski-Sachs singularity for Black Holes
Catarina Bastos, Orfeu Bertolami, Nuno Costa Dias +1
We consider a cosmological model based upon a non-canonical noncommutative extension of the Heisenberg-Weyl algebra to address the thermodynamical stability and the singularity pro…
Comment on 'A close examination of the motion of an adiabatic piston' by Eric A. Gislason [Am. J. Phys. 78, 995-1001 (2010)]
Rodrigo de Abreu, Vasco Guerra
A recent paper by Gislason published in Am. J. Phys. deals with the celebrated example of the so-called "adiabatic piston", a system involving two ideal gases contained in a horizo…
Spin dephasing and pumping in graphene due to random spin-orbit interaction
V. K. Dugaev, E. Ya. Sherman, J. Barnas
We consider spin effects related to the random spin-orbit interaction in graphene. Such a random interaction can result from the presence of ripples and/or other inhomogeneities at…
AAMQS: A non-linear QCD analysis of new HERA data at small-x including heavy quarks
J. L. Albacete, N. Armesto, J. G. Milhano +2
We present a global analysis of available data on inclusive structure functions and reduced cross sections measured in electron-proton scattering at small values of Bjorken-x, x<0.…
Magnetic impurity in a -Spin Liquid with a Spinon Fermi-Surface
P. Ribeiro, P. A. Lee
We address the problem of a magnetic impurity in a two dimensional spin liquid where the spinons have gap-less excitations near the Fermi-surface and are coupled to an emerg…